Optimizing the performance of your Thermo Scientific Model 43i SO2 Analyzer Series

Prior to putting your Thermo Scientific™ Model 43i SO₂ Analyzer into service or performing the final compliance calibration, you may want to perform a pre-calibration of the unit. Thermo Scientific Model 43i SO2 Analyzer series pre-calibration procedures are specific to the individual model. Click on the link below for your specific model’s setup procedure:

Thermo Scientific™ Model 43i SO2 Analyzer Pre-Calibration*
Thermo Scientific™ Model 43i-HL High Level SO2 Analyze Pre-Calibration*
Thermo Scientific™ Model 43i-TLE Trace Level SO2 Analyze Pre-Calibration*

Each model requires a different lamp voltage setting, see table below for the appropriate volts and life expectancy for your particular SO₂ Analyzer.  Please note, when installing the Model 43i UV Lamp ensure your lamp is fully seated into the lamp socket. If it is not properly seated, there is a chance of arcing which will shorten the life of the lamp.

DO NOT attempt to clean the mirrors in the mirror housing assembly. These mirrors do not come in contact with the sample gas and should not be cleaned. Cleaning the mirrors can damage them. If you need to replace the entrance mirror or mirror block housing due to UV degradation, see Mirror Housing Technical Bulletin  for details*. 

When the Thermo Scientific Model 43i SO2 Analyzer is exhibiting lamp voltage alarms or an intensity alarm, it may be related to one of three components: Flash Lamp, UV Socket Assembly or the Flash Intensity Assembly. Symptoms could also be related to the measurement interface board or mirror block assembly but that would be in the more remote instance. See Troubleshooting Technical Bulletin  for details.*

The kicker is a tube that removes hydrocarbons from the sample by forcing the hydrocarbon molecules to permeate through the tube wall. The SO2 molecules pass through the hydrocarbon “kicker” unaffected. It typically has a lifespan of three to five years depending on the application. If you are experiencing non-linear performance, it could be your hydrocarbon kicker. Inspect your hydrocarbon kicker for color changes. If the majority of the tubing is discolored, this could be an indication that your kicker needs to be replaced. It is also possible to have no discoloration and have a faulty kicker if there is a pin hole leak in the tubing, for example. To order this replacement part (part #8746) email or call Customer Service at (866) 282-0430, option 1.